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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812e66802ebde2475ce3be01b12a83fd13f44d360a8b6b46562a9bebe4352a13' 
  AND token = 'yB5nWqRQpDd6Abvk8J7o2FZ71xsEr8TwbD2yZN4Dt+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}